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Magical twins, mystery and danger, unexplained events, and an Evil that refuses to be contained ... Book four in the gripping series from fantasy masters Garth Nix and Sean Williams.

Trouble is looming over the quiet coastal town of Portland. A door has been opened to the Evil Dimension, and twins Jack and Jaide are about to face their greatest challenge ever ...

Jack and Jaide Shield finally learn what it means to be a warden in training as they pit their wits and gifts against mysterious fellow troubletwister Stefano Battaglio. But the competition soon gets serious when a way is opened to the dangerous realm of the Evil. Grandma X discovers her twin sister, Lottie, is stranded there - but she's forbidden from travelling through the vortex to look for her. That doesn't stop Jaide and Jack from trying, and the rescue becomes urgent when the twins find out about a plan that will trap Lottie on the other side forever. Can the twins find Lottie, defeat the Evil and get everyone safely home to Portland - before it's too late?

About the Author

Garth Nix is best known for his award-winning fantasies Sabriel, Lirael and Abhorsen and the seven books of the Keys to the Kingdom series. His books have appeared on the bestseller lists of the New York Times, Publishers Weekly, the Guardian, the Sunday Times and the Australian. Garth lives in Sydney with his wife and two sons.

Sean Williams is best known for his award-winning space opera series and is the number-one New York Times-best-selling author of Star Wars: The Force Unleashed. He is also the author of the Twinmaker series for young adults and the Books of the Change. Sean lives in Adelaide with his wife and family.

Sean Williams, the New York Times best-selling speculative fiction author lives in Adelaide, South Australia. He has written many novels, including the Books of the Cataclysm and The Resurrected Man, and is a multiple recipient of both the Ditmar & Aurealis Awards. He has also written several novels in the Star Wars universe, including the best-selling Star Wars: The Force Unleashed.

Garth Nix was born in 1963 in Melbourne, Australia. A full-time writer since 2001, he has worked as a literary agent, marketing consultant, book editor, book publicist, book sales representative, bookseller, and as a part-time soldier in the Australian Army Reserve.

Garth’s books include the award-winning fantasy novels Sabriel, Lirael and Abhorsen; and the cult favourite YA SF novel Shade’s Children. His fantasy novels for children include The Ragwitch; the six books of The Seventh Tower sequence, and The Keys to the Kingdom series.

More than five million copies of his books have been sold around the world, his books have appeared on the bestseller lists of The New York Times, Publishers Weekly, The Guardian and The Australian, and his work has been translated into 37 languages.